module tb_top();

   logic Cout, Sum;
   logic A, B, Cin;
   
   //FA fa0(Cout, Sum, A, B, Cin);
   HA ha0(Cout, Sum, A, B);
   
   

   initial begin
      for(int i=0;i<=7;i++)
	begin
	   #10 {A, B, Cin} = i[2:0];
	end
   end

endmodule // tb_top
